As many as a dozen bodies were found on Tuesday scattered around the northern Mexico industrial hub of Monterrey and its suburbs, including some of the wealthiest neighbourhoods in the country.
Prosecutors in the state of Nuevo Leon did not provide a final tally of the number of dead because some of the bodies had been found in pieces or were dumped in plastic bags.
But prosecutors confirmed at least seven bodies had been found, as well as five bags of body parts.
Gerardo Palacios, the head security official of Nuevo Leon state, said the killings appeared related to an internal dispute within a drug cartel based in the neighbouring state of Tamaulipas.
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The Gulf and Northeast cartels operate there, but he did not specify which he was referring to.
“What we see here is an internal purge within an organised crime group based in Tamaulipas, because of some acts of disloyalty within the group,” Palacios said.
Drug cartels in Mexico often leave dismembered bodies on streets, often with banners threatening officials or rival gangs.
The grisly discovery came the day after drug cartel banners had been left around the city. It contrasted with Monterrey's recent reputation for success after it was chosen as the site of a new Tesla car plant.
Monterrey suffered waves of drug cartel violence in the 2010s, but had become more peaceful until Tuesday's events.
